The significance of absence of one umbilical artery.
D000015:Abnormalities, Multiple / Q000209:etiology; D000328:Adult; D000740:Anemia; D001724:Birth Weight; D002675:Child, Preschool; D000013:Congenital Abnormalities / Q000209:etiology; D003920:Diabetes Mellitus; D004200:Diseases in Twins; D004827:Epilepsy; D005260:Female; D005313:Fetal Death; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D008297:Male; D008431:Maternal-Fetal Exchange; D008946:Mitral Valve Stenosis; D010923:Placenta Previa; D006473:Postpartum Hemorrhage; D011225:Pre-Eclampsia; D011247:Pregnancy; D011248:Pregnancy Complications; D014397:Tuberculosis, Pulmonary; D014469:Umbilical Arteries / Q000002:abnormalities*